Practical 11 PPS

 Write a C Program to demonstrate the use of inbuilt string functions.

#include <stdio.h>

#include <string.h>

int main()

{

    char str1[20] = "Hello";

    char str2[20] = "World";

    // strlen(): returns the length of the string

    printf("Length of str1: %d\n", strlen(str1));

    // strcat(): concatenates two strings

    strcat(str1, str2);

    printf("Concatenated string: %s\n", str1);

    // strcmp(): compares two strings lexicographically

    int result = strcmp(str1, str2);

    if (result == 0)

    {

        printf("Strings are equal\n");

    }

    else if (result < 0)

    {

        printf("str1 is less than str2\n");

    }

    else

    {

        printf("str1 is greater than str2\n");

    }

    // strcpy(): copies one string to another

    strcpy(str1, "Goodbye");

    printf("New string: %s\n", str1);

    // strchr(): finds the first occurrence of a character in a string

    char *ptr = strchr(str1, 'b');

    printf("First occurrence of 'b': %s\n", ptr);

    // strstr(): finds the first occurrence of a substring in a string

    ptr = strstr(str1, "bye");

    printf("First occurrence of 'bye': %s\n", ptr);

    return 0;

}

Write a function power that computes x raised to the power y for integer x and y and returns double type value.

#include <stdio.h>

#include <conio.h>

#include <math.h>

int power(int a, int b);

void main()

{

    int x, y;

    clrscr();

    printf("enter the x:");

    scanf("%d", &x);

    printf("enter the y:");

    scanf("%d", &y);

    power(x, y);

    getch();

}

int power(int a, int b)

{

    double c;

    c = pow(a, b);

    printf("\n ans=%lf", c);

    return 0;

}

Write a calculator program (add, subtract, multiply, divide). Prepare user defined function for each functionality.

#include <stdio.h>

// functions declaration

int add(int n1, int n2);

int subtract(int n1, int n2);

int multiply(int n1, int n2);

int divide(int n1, int n2);

// main function

int main()

{

    int num1, num2;

    printf("Enter two numbers: ");

    scanf("%d %d", &num1, &num2);

    printf("%d + %d = %d\n", num1, num2, add(num1, num2));

    printf("%d - %d = %d\n", num1, num2, subtract(num1, num2));

    printf("%d * %d = %d\n", num1, num2, multiply(num1, num2));

    printf("%d / %d = %d\n", num1, num2, divide(num1, num2));

    return 0;

}

// function to add two integer numbers

int add(int n1, int n2)

{

    int result;

    result = n1 + n2;

    return result;

}

// function to subtract two integer numbers

int subtract(int n1, int n2)

{

    int result;

    result = n1 - n2;

    return result;

}

// function to multiply two integer numbers

int multiply(int n1, int n2)

{

    int result;

    result = n1 * n2;

    return result;

}

// function to divide two integer numbers

int divide(int n1, int n2)

{

    int result;

    result = n1 / n2;

    return result;

}